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From: Kalle Valo <kvalo@kernel.org>
To: Ilpo =?utf-8?Q?J=C3=A4rvinen?= <ilpo.jarvinen@linux.intel.com>
Cc: linux-pci@vger.kernel.org,  Bjorn Helgaas <bhelgaas@google.com>,
  Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,  Rob Herring
 <robh@kernel.org>,  Krzysztof =?utf-8?Q?Wilczy=C5=84ski?= <kw@linux.com>,
  Emmanuel Grumbach <emmanuel.grumbach@intel.com>,  "Rafael J . Wysocki"
 <rafael@kernel.org>,  Heiner Kallweit <hkallweit1@gmail.com>,  Lukas
 Wunner <lukas@wunner.de>,  "David S. Miller" <davem@davemloft.net>,  Eric
 Dumazet <edumazet@google.com>,  Jakub Kicinski <kuba@kernel.org>,  Paolo
 Abeni <pabeni@redhat.com>,  Sriram R <quic_srirrama@quicinc.com>,  P
 Praneesh <quic_ppranees@quicinc.com>,  Ramya Gnanasekar
 <quic_rgnanase@quicinc.com>,  Karthikeyan Periyasamy
 <quic_periyasa@quicinc.com>,  Vasanthakumar Thiagarajan
 <quic_vthiagar@quicinc.com>,  ath12k@lists.infradead.org,
  linux-wireless@vger.kernel.org,  netdev@vger.kernel.org,
  linux-kernel@vger.kernel.org,  Dean Luick
 <dean.luick@cornelisnetworks.com>,  Andy Shevchenko
 <andriy.shevchenko@linux.intel.com>,  stable@vger.kernel.org
Subject: Re: [PATCH v2 8/9] wifi: ath12k: Use RMW accessors for changing LNKCTL
References: <20230517105235.29176-1-ilpo.jarvinen@linux.intel.com>
	<20230517105235.29176-9-ilpo.jarvinen@linux.intel.com>
Date: Wed, 17 May 2023 14:03:57 +0300
In-Reply-To: <20230517105235.29176-9-ilpo.jarvinen@linux.intel.com> ("Ilpo
	\=\?utf-8\?Q\?J\=C3\=A4rvinen\=22's\?\= message of "Wed, 17 May 2023 13:52:34
 +0300")
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Ilpo J=C3=A4rvinen <ilpo.jarvinen@linux.intel.com> writes:

> Don't assume that only the driver would be accessing LNKCTL. ASPM
> policy changes can trigger write to LNKCTL outside of driver's control.
>
> Use RMW capability accessors which do proper locking to avoid losing
> concurrent updates to the register value. On restore, clear the ASPMC
> field properly.
>
> Fixes: d889913205cf ("wifi: ath12k: driver for Qualcomm Wi-Fi 7 devices")
> Suggested-by: Lukas Wunner <lukas@wunner.de>
> Signed-off-by: Ilpo J=C3=A4rvinen <ilpo.jarvinen@linux.intel.com>
> Cc: stable@vger.kernel.org

Acked-by: Kalle Valo <kvalo@kernel.org>

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